title: A triclinic polymorph of (E)-2-(4-iso-butyl-phen-yl)-N'-[1-(4-nitro-phen-yl)ethyl-idene]propano-hydrazide.
abstract: The asymmetric unit of the triclinic polymorph of the title compound, C21H25N3O3, consists of two mol-ecules, whereas for the monoclinic polymorph Z' = 1 [Fun et al. (2009 ▶). Acta Cryst. E65, o445]. The two mol-ecules exhibit an E configuration with respect to the C=N bond. The mol-ecules are linked into dimers by N-H⋯O and C-H⋯O hydrogen bonds forming R 2 (2)(8) ring motifs. In addition, π-π inter-actions occur between nitro-phenyl groups [minimum centroid-centroid distance 3.940 (2) Å], stacking the molecules along the ac plane.
authors.affiliation: Department of Studies in Physics, Manasagangotri, University of Mysore, Mysore, 570 006, India.
authors.forename: B C
authors.initials: BC
authors.lastname: Manjunath
authors.forename: S
authors.initials: S
authors.lastname: Madan Kumar
authors.forename: A C
authors.initials: AC
authors.lastname: Vinayaka
authors.forename: S
authors.initials: S
authors.lastname: Jayasheelan
authors.forename: M P
authors.initials: MP
authors.lastname: Sadashiva
authors.forename: N K
authors.initials: NK
authors.lastname: Lokanath